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A key question in categorization is how infants extract regularities from the exemplars they encounter. Detecting similarities and dissimilarities across items is vital in order to determine category-relevant features. Previous research found evidence that infants acquire a single category more easily with paired presentations in comparison with single presentations (Oakes & Ribar, 2005, Infancy, 7, 85; Oakes & Kovack-Lesh, 2007, Cogniție, Creier, Comportament / Cognition, Brain, Behavior, XI, 661). Here, we focus on infants' acquisition of a category contrast, that is, when they are exposed to two categories. In an eye-tracking study, we examined 10-month-old infants' ability to learn two novel visual categories when presented with one item at a time and with items in pairs. Infants were familiarized with pairs of items from the same category or with pairs of items from different categories (cross-category pairs). Using a linear model with a priori contrasts, we show that infants' learning is directly related to the opportunity for category comparison: There is no evidence of category learning in the single-item condition, improved performance when familiarized with same-category pairs, and finally robust category learning when familiarized with cross-category pairs. We conclude that comparison which involves items from different categories promotes category formation, by highlighting differences and promoting a discovery of category boundaries., (© 2022 The Authors. Infancy published by Wiley Periodicals LLC on behalf of International Congress of Infant Studies.)

We investigated the impact of two highly salient transient features, labels and motions, on novel visual category learning in 10-month-old infants. In three eye-tracking experiments, infants were presented with exemplars from two novel categories either accompanied by category-specific labels, accompanied by category-specific motions, or in silence. Labels (Experiment 1) and motions (Experiment 2) were presented using a gaze-contingent design in which these transient features were triggered by infants' fixations. Gaze-contingent transient features, despite being redundant, had a strong impact on categorization. The results revealed that both labels and motions support infants' category formation. Furthermore, both labels and motions promoted similarity-focused exploration, whereas no such pattern was found when infants learned the categories in silence. Analyses of visual exploration patterns revealed that infants readily form expectations about motion properties of categories and that these expectations drive their looking behavior., (Copyright © 2020 Elsevier Inc. All rights reserved.)

When and how do infants learn color words? It is generally supposed that color words are learned late and with a great deal of difficulty. By examining infant language surveys in British English and 11 other languages, this study shows that color word learning occurs earlier than has been previously suggested and that the order of acquisition of color words is similar in related languages. This study also demonstrates that frequency and syllabic complexity can be used to predict variability in infant color word learning across languages. In light of recent evidence indicating that color categories have universal biological foundations, these findings suggest that infants' experience and linguistic exposure drive their shift to culturally and linguistically mediated adult-like understandings of color words., (© 2018 Society for Research in Child Development.)

How does variability between members of a category influence infants' category learning? We explore the impact of the order in which different items are sampled on category formation. Two groups of 10-months-olds were presented with a series of exemplars to be organized into a single category. In a low distance group, the order of presentation minimized the perceptual distance between consecutive exemplars. In a high distance group, the order of presentation maximized the distance between successive exemplars. At test, only infants in the High Distance condition reliably discriminated between the category prototype and an atypical exemplar. Hence, the order in which infants learnt about the exemplars impacted their categorization performance. Our findings demonstrate the importance of moment-to-moment variations in similarity during infants' category learning., (Copyright © 2011 Elsevier B.V. All rights reserved.)

Over the past few decades there has been a lot of debate about language learning and the opinion about the status of mental rule during the process of language learning is still divided between different researches. The present study examines learning morphology of German noun plurals based on rules, examples or on both, rules and examples. The results across these three experimental conditions suggest that the morphological patterns are learned more easily in the form of rules and thus, seem to be more easily captured by dual-route (which suggest that rules and exceptions are processed by two qualitatively different mechanisms) than single route theories (which suggest a singe mechanism for processing both rules and exceptions). However, a closer examination of error patterns across the five rules (-e, -n, -er, Ø, -s) revealed results confronting dual-route theories and suggest the existence of two rulemechanisms (-n and -s) rather than one for learning regular inflection in German plural nouns. Moreover, the second rule (with plural ending -n) was the easiest one to be learned, although it is the fifth rule (with plural ending -s) which is considered as a default rule in German.

Previous research has highlighted the difficulty that infants have in learning to use color words. Even after acquiring the words themselves, infants are reported to use them incorrectly, or overextend their usage. We tested 146 infants from 5 different age groups on their knowledge of 6 basic color words, red, green, yellow, blue, black, and white, using an intermodal preferential looking task. The results showed that infants show reliable comprehension of color words as early as 19 months of age. No order of acquisition effects were observed. In addition, infants' behavior in the task was facilitated by the provision of redundant noun information, "Look at the red car," and even general referential noun phrases, "Look at the red one," with greater looking to the target than when the color label was not presented in adjective position, "Look, red." The findings indicate that color words may be learned with greater ease than previously thought, verifying recent parental reports showing similar findings. The findings also suggest that 19 month olds have already developed an expectation that color labels should occur in adjectival position. [ABSTRACT FROM AUTHOR]

Two experiments explored learning, generalization, and the influence of Semantics on orthographic processing in an artificial language. In Experiment 1, 16 adults learned to read 36 novel words written in novel characters. Posttraining, participants discriminated trained from untrained items and generalized to novel items, demonstrating extraction of individual character sounds. Frequency and consistency effects in learning and generalization showed that participants were sensitive to the statistics of their learning environment. In Experiment 2, 32 participants were preexposed to the sounds of all items (lexical phonology) and to novel definitions for half of these items (semantics). Preexposure to either lexical phonology or semantics boosted the early stages of orthographic learning relative to Experiment I. By the end of training, facilitation was restricted to the semantic condition and to items containing low-frequency inconsistent vowels. Preexposure reduced generalization, suggesting that enhanced item-specific learning was achieved at the expense of character-sound abstraction. The authors' novel paradigm provides a new tool to explore orthographic learning. Although the present findings support the idea that semantic knowledge supports word reading processes, they also suggest that item-specific phonological knowledge is important in the early stages of learning to read. [ABSTRACT FROM AUTHOR]

We present a neurocomputational model with self-organizing maps that accounts for the emergence of taxonomic responding and fast mapping in early word learning, as well as a rapid increase in the rate of acquisition of words observed in late infancy. The quality and efficiency of generalization of word-object associations is directly related to the quality of prelexical, categorical representations in the model. We show how synaptogenesis supports coherent generalization of word-object associations and show that later synaptic pruning minimizes metabolic costs without being detrimental to word learning. The role played by joint-attentional activities is identified in the model, both at the level of selecting efficient cross-modal synapses and at the behavioral level, by accelerating and refining overall vocabulary acquisition. The model can account for the qualitative shift in the way infants use words, from an associative to a referential-like use, for the pattern of overextension errors in production and comprehension observed during early childhood and typicality effects observed in lexical development. Interesting by-products of the model include a potential explanation of the shift from prototype to exemplar-based effects reported for adult category formation, an account of mispronunciation effects in early lexical development, and extendability to include accounts of individual differences in lexical development and specific disorders such as Williams syndrome. The model demonstrates how an established Constraint on lexical learning, which has often been regarded as domain-specific, can emerge from domain-general learning principles that are simultaneously biologically, psychologically, and socially plausible. [ABSTRACT FROM AUTHOR]

What role does contextual information play in children’s early word comprehension? Using an inter-modal preferential looking task, we investigated how different background contexts influence children’s looking times before and after an image has been named. Prior to the experiment, early comprehension of words was assessed using parental questionnaires. Typicality of objects against different backgrounds was pre-assessed in typicality ratings with adults. In the experiments with the children, 15- and 18-month-olds were shown stimuli depicting pairs of objects or pairs of animals: both stimuli appeared against a neutral background, a typical background or an atypical background. Half way through each testing trial, one of the two stimuli was named. It was predicted that children’s looking behaviour at the named target would be affected by the naming event and the background context, with children devoting longer time to inspect named images in atypical backgrounds than in typical backgrounds. We further anticipated that background effects would be stronger for younger children as compared to older children. These predictions were confirmed insofar as naming effects in 15-month-olds’ varied with background condition, whereas 18-month-olds showed similar effects of naming across all background conditions. However, unexpectedly, 15-month-olds showed a naming effect in atypical and neutral backgrounds, but not in typical backgrounds. Methodological issues concerning the use of backgrounds in inter-modal preferential looking tasks, and the implications of the role of background context for children’s early word comprehension are discussed. [Copyright &y& Elsevier]

Previous studies demonstrate that while toddlers can match words with their referent before the age of one, they only begin to extract phonologically- and semantically-related information from speech later in the second year. However, the order and manner in which this information is extracted remains unresolved. In two experiments, we adapted the adult four-picture Visual World Paradigm (VWP) (Huettig & McQueen, 2007) for toddler testing: toddlers hear a spoken word and see pictures that are phonologically-related, semantically-related or unrelated to the spoken-word. We demonstrate that, similar to adults, 24- to 30-month-old toddlers attended to a phonological match faster than a semantic match, and that these differences hold irrespective of whether the semantic match is taxonomic or thematic in character. Our findings suggest that language shapes toddlers’ cognition by biasing their selective attention to relevant information in the visual world, which is likely to enhance the efficiency of mental activities, such as learning and making analogical inferences. [ABSTRACT FROM AUTHOR]